<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 登录表单区域 -->
      <el-form
        ref="loginFormRef"
        :model="LoginForm"
        :rules="LoginFormRules"
        label-width="0px"
        class="login_form"
      >
        <!-- 用户名区域 -->
        <el-form-item prop="username">
          <el-input
            v-model="LoginForm.username"
            prefix-icon="el-icon-user-solid"
          ></el-input>
        </el-form-item>
        <!-- 密码区域 -->
        <el-form-item prop="password">
          <el-input
            v-model="LoginForm.password"
            prefix-icon="el-icon-lock"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" round @click="login">登录</el-button>
          <el-button type="info" round @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>
<script>
  export default {
    //这是表单区域的数据双向绑定
    data() {
      return {
        LoginForm: {
          username: 'admin',
          password: '123456',
        },
        LoginFormRules: {
          // 判断用户名是否合法
          username: [
            { required: true, message: '请输入登录名称', trigger: 'blur' },
            { min: 3, max: 8, message: '长度在 3 到 8 个字符', trigger: 'blur' },
          ],
          // 判断密码是否合法
          password: [
            { required: true, message: '请输入登录密码', trigger: 'blur' },
            {
              min: 6,
              max: 12,
              message: '长度在 6 到 12 个字符',
              trigger: 'blur',
            },
          ],
        },
      }
    },
    methods: {
      //点击重置按钮,重置登录表单
      resetLoginForm() {
        // console.log(this);
        this.$refs.loginFormRef.resetFields()
      },
      login() {
        //点击登录,实现登陆前预验证
        this.$refs.loginFormRef.validate(async (valid) => {
          // console.log(valid);
          if (!valid) return
          const { data: res } = await this.$http.post('login', this.LoginForm)
          // console.log(res);
          if (res.meta.status !== 200)
            return this.$message.error('警告哦，登录失败')
          this.$message.success('恭喜您,登录成功')
          //1.将登陆成功之后的token,保存到客户端的sessionStorage中
          // 1.项目中除了登陆之外的其他api接口,必须在登陆之后才能访问
          // 2.token只应在当前网站打开期间生效.所以将token保存至sessionStorage中
          window.sessionStorage.setItem('token', res.data.token)
          // 2.通过编程式导航跳转到后台主页,路由地址是 /home
          this.$router.push('/home')
        })
      },
    },
  }
</script>
<style lang="less">
  .login_container {
    background-color: #2b4b6b;
    height: 100%;
  }
  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 5px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
  }
  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    box-shadow: 0 0 10px #ddd;
    padding: 10px;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #fff;
    }
  }
  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }
  .btns {
    display: flex;
    justify-content: flex-end;
  }
</style>
